Metrohm 746 VA Trace Analyzer - Manual (Page 132)

4.4 Lead determination with internal standard
746 VA Trace Analyzer / 747 VA Stand
4-47
Report Full Printout of the full result report on the printer
Curve Cal Sbst:Pb Printout of the calibration curve on the printer
• Press the softkey <Comment> . The subpage of "DOCUMENTATION"
appears with the method comment describing, among other things, the
procedure used in the calibration method with the internal standard.
• Finally press the <ESC> key to return to the main page of "DOCUMEN-
TATION".
4.4.4 Recording the calibration curve
To be able to perform a determination with the internal standard, the proportionality
factor must first be determined using a calibration curve. The following steps are
necessary for this:
1 Switch to dialog page "MONITORING"
• Press the yellow <MONITORING> key. The dialog page "MONITORING"
whose header shows the loaded method INTSTD appears.
2 Switch the program run mode to calibration
If the parameter Run mode is set to determination , proceed as follows:
• Use the cursor keys to select the field Run mode .
• Press the space bar to enter the edit mode.
• Press the softkey <calibr.> and confirm this entry with the <ENTER>
key.
3 Entry of the sample volume
Enter the sample volume as follows:
• Use the cursor keys to select the first field below the title Sample
size/S0 .
• Press the space bar to enter the edit mode.
• Enter either * or 10 mL (as preparation for performance of the determi-
nation in section 4.4.5) and confirm this entry with the <ENTER> key.
Although the sample volume for recording the calibration curve is not needed (the
volume of the calibration solutions is defined in the parameter V0.CSoln), the
Sample size/S0 field must not be empty.
4 Start the determination
• Press the red <START> key.
• The status display in the header of the dialog page "MONITORING"
switches to * BUSY * , the start time of the measurement is entered un-
der Determination and the determination is given a standard name,
also formed from the start time. Further, during the measurement the
measurement window is superimposed which shows the current pro-
gram line being executed and the remaining line time.